64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
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/* Type lookup.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of libctf.
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libctf is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not see
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<http://www.gnu.org/licenses/>. */
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#include <ctf-impl.h>
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#include <elf.h>
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#include <string.h>
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/* Return the pointer to the internal CTF type data corresponding to the
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given type ID. If the ID is invalid, the function returns NULL.
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This function is not exported outside of the library. */
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const ctf_type_t *
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ctf_lookup_by_id (ctf_file_t **fpp, ctf_id_t type)
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{
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ctf_file_t *fp = *fpp; /* Caller passes in starting CTF container. */
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ctf_id_t idx;
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if ((fp->ctf_flags & LCTF_CHILD) && LCTF_TYPE_ISPARENT (fp, type)
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&& (fp = fp->ctf_parent) == NULL)
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{
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(void) ctf_set_errno (*fpp, ECTF_NOPARENT);
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return NULL;
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}
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idx = LCTF_TYPE_TO_INDEX (fp, type);
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if (idx > 0 && (unsigned long) idx <= fp->ctf_typemax)
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{
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*fpp = fp; /* Function returns ending CTF container. */
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return (LCTF_INDEX_TO_TYPEPTR (fp, idx));
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}
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/* If this container is writable, check for a dynamic type. */
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if (fp->ctf_flags & LCTF_RDWR)
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{
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ctf_dtdef_t *dtd;
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if ((dtd = ctf_dynamic_type (fp, type)) != NULL)
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{
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*fpp = fp;
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return &dtd->dtd_data;
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}
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}
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(void) ctf_set_errno (*fpp, ECTF_BADID);
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return NULL;
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}
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